Visual: central AC fan effect on CO2 distribution – GreenBuildingAdvisor

https://imgur.com/a/nAi9cgw

I have two ervs supplying 4 bedrooms via dedicated ducts.

They supply into the bedrooms and get back to the returns which are placed in the conditioned attic, via 2 inch undercuts on on the bedroom doors.

Looking at the above image you can see a very close distribution when the heat pump fan is running.

Once the fan stopped it’s interesting to see how the CO2 in the empty room(craft room) went down, and the CO2 in the farthest room (boy bedroom) went up.

Then, once I turned the fan back on, you can see the numbers start to reconverge.